Sentry locks down your computer on demand so it stays secure when you aren't using it. No other programs can be opened, no browser history snooped at, and nobody will be touching your files while you're gone. Sentry even takes messages from people who dropped by while you were away. The program appearance is customizable, and can be quickly deployed to a USB flashdrive, floppy disk, or CD to quickly lock any public workstation you may use.